#include <stdio.h>

int main(void)
{
    printf("\n");

    int a = 1, b = 1;

    int a_post, pre_b;

    a_post = a++; // 后缀递增

    pre_b = ++b; // 前缀递增

    printf("a a_post b pre_b \n");

    printf("%1d %5d %5d %5d\n", a, a_post, b, pre_b);

    return 0;
}